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TITLE:
SILC "silc_pkcs1_decode" Integer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA29463

VERIFY ADVISORY:
http://secunia.com/advisories/29463/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
SILC Secure Internet Live Conferencing Toolkit 1.x
http://secunia.com/product/14731/
SILC Secure Internet Live Conferencing Server 1.x
http://secunia.com/product/1029/
SILC Secure Internet Live Conferencing Client 1.x
http://secunia.com/product/5645/

DESCRIPTION:
A vulnerability has been reported in SILC Client, Server, and
Toolkit, which can be exploited by malicious people to cause a DoS
(Denial of Service) and potentially compromise a vulnerable system.

The vulnerability is caused due to an integer overflow error in the
"silc_pkcs1_decode" function in lib/silccrypt/silcpkcs1.c. This can
be exploited to cause a buffer overflow via a specially crafted
PKCS#1 block.

The vulnerability is reported in SILC Toolkit prior to 1.1.7, SILC
Client prior to 1.1.4, and SILC Server prior to 1.1.2.

SOLUTION:
SILC Toolkit:
Update to version 1.1.7.
http://silcnet.org/software/download/toolkit/

SILC Client:
Update to version 1.1.4.
http://silcnet.org/software/download/client/

SILC Server:
Update to version 1.1.2.
http://silcnet.org/software/download/server/

PROVIDED AND/OR DISCOVERED BY:
Ariel Waissbein, Pedro Varangot, Martin Mizrahi, Oren Isacson, Carlos
Garcia, and Ivan Arce of Core Security Technologies.

ORIGINAL ADVISORY:
SILC:
http://silcnet.org/general/news/?item=toolkit_20080320_1
http://silcnet.org/general/news/?item=client_20080320_1
http://silcnet.org/general/news/?item=server_20080320_1

Core Security:
http://www.coresecurity.com/?action=item&id=2206

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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